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OBJECTIVE To determine the effect of Körner's septum (KS) on graft success and hearing in patients who were treated with type 1 tympanoplasty. STUDY DESIGN An observational study. PLACE AND DURATION OF STUDY Department of Otorhinolaryngology, University of Health Sciences, Ankara Numune Training and Research Hospital, Turkey, from July 2013 to July 2018. METHODOLOGY Patients undergoing type 1 tympanoplasty were divided into 2 groups as patients with KS and without KS (WKS), according to the findings of high-resolution computed tomograph